气候变化领域集成服务门户(CCPortal): A climatology of daily synoptic circulation patterns and associated surface meteorology over southern South America

CCPortal

DOI	10.1007/s00382-019-04768-3
	A climatology of daily synoptic circulation patterns and associated surface meteorology over southern South America
	Loikith P.C.; Pampuch L.A.; Slinskey E.; Detzer J.; Mechoso C.R.; Barkhordarian A.
发表日期	2019
ISSN	0930-7575
起始页码	4019
结束页码	4035
卷号	53 期号:2020-07-08
英文摘要	Synoptic circulation patterns, defined as anomalies in sea level pressure (SLP), 500 hPa geopotential height (Z500), and 250 hPa wind speed (V250) and referred to as large-scale meteorological patterns (LSMPs), are characterized using the self-organizing maps approach over southern South America. Results show a wide range of possible LSMP types over a 37-year period of study. LSMP type variability can be summarized as a spectrum from patterns dominated by positive SLP and Z500 anomalies with a poleward displacement of the strongest 250 hPa winds, to patterns dominated by similar structures but with anomalies of opposite sign. The LSMPs found are connected with lower tropospheric temperature and wind, precipitation, and the frequency of atmospheric rivers (ARs). This highlights LSMPs more closely associated with anomalous and potentially impactful surface meteorology. Results show ARs as primary drivers of heavy precipitation over some of the region and connect their occurrence to driving synoptic dynamics. Two important low frequency modes of climate variability, the Southern Annular Mode (SAM) and the El Nino Southern Oscillation (ENSO), show some influence on the frequency of LSMP type, with the SAM more directly related to LSMP type modulation than ENSO. This comprehensive climatology of synoptic variability across southern South America has potential to aid in a mechanistic approach to studying climate change projections of temperature, precipitation, and AR frequency in climate models. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Atmospheric rivers; South America; Synoptic climatology
语种	英语
scopus关键词	atmospheric circulation; climate change; diurnal variation; geopotential; precipitation (climatology); sea level pressure; synoptic meteorology; wind velocity; South America
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145992
作者单位	Department of Geography, Portland State University, Portland, OR, United States; Departamento de Engenharia Ambiental, Instituto de Ciência e Tecnologia, UNESP-Univ. Estadual Paulista, Campus São José dos Campos, São José dos Campos, SP, Brazil; Department of Atmospheric and Oceanic Sciences, University of California Los Angeles, Los Angeles, CA, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States
推荐引用方式 GB/T 7714	Loikith P.C.,Pampuch L.A.,Slinskey E.,et al. A climatology of daily synoptic circulation patterns and associated surface meteorology over southern South America[J],2019,53(2020-07-08).
APA	Loikith P.C.,Pampuch L.A.,Slinskey E.,Detzer J.,Mechoso C.R.,&Barkhordarian A..(2019).A climatology of daily synoptic circulation patterns and associated surface meteorology over southern South America.Climate Dynamics,53(2020-07-08).
MLA	Loikith P.C.,et al."A climatology of daily synoptic circulation patterns and associated surface meteorology over southern South America".Climate Dynamics 53.2020-07-08(2019).